Change that seems to enable EBPF back end to build on Ubuntu 16.04 (#2049)
Change that seems to enable EBPF back end to build on Ubuntu 16.04 (#2049)

* Change that seems to enable EBPF back end to build on Ubuntu 16.04

mbudiu-vmw/p4c-clone,p4lang/p4c,p4lang/p4c,p4lang/p4c,p4lang/p4c,mbudiu-vmw/p4c-clone,mbudiu-vmw/p4c-clone,hanw/p4c,p4lang/p4c,hanw/p4c,hanw/p4c,hanw/p4c,mbudiu-vmw/p4c-clone